Vertical spacer bars on main spar

[DesertBearhawk]

I am fitting my vertical spacer bars on my main spar. The plans indicate three holes in the bars. With the two rivet holes in the cap strips you would have 5 rivets holding the rib attach angles to the spar. I noticed in the builders guide that he has drilled 5 holes in the spacer bars and has set a double flush rivet in the center hole to hold the bars in position. I do not see this indicated on the plans. Am I missing something or is this a convenience modification? Please advise.

[bestbearhawk1231]

This came up a couple years ago and if I remember correctly, it was a convenience mod to hold everything together.

[bpaynebearhawk]

I have the same question WRT 4 place, plans, sheet 6, rev 2, dated 10-10-02.

I see three holes in the main spar spacer bar with 2 in the cap strips for a total of 5 rivets attaching rib attach angles to spar. (counting the center double flush rivet).
Eric's builder manual shows 5 rivets in the spacer bar plus 2 in the cap spars for a total of 7 rivets. Which is correct??

I am leaning toward following Bob's drawing.

Looking at the drawing more closely, it appears that maybe Bob revised the drawing to delete 2 rivets. You can see that there appears to have been an erasure at the location of the "extra" rivets.
Anyone else notice this??

Thanks, Bill

[Gary Wallace]

I skipped the double flush rivet in the center, but still did use the five straight through rivets in between cap srrips, plus the two in the cap strips. A total of seven. I would recommend not using any convenience double flush rivets, wether you go with the 5 or 7 total rivets. If there was the option when i did mine, i would absolutely go with the total of 5 rivets, not 7, and would skip any double flush rivets. It was, in my opinion, easiest with no flush rivets. Sorry i cant answer the original question regarding the number of rivets, but i do believe 7 is overkill. Fwiw